Question about 1999 Ford Explorer

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Battery voltage/rough idle

2000 Ford Ranger. The battery gauge needle decreases when I acclerate-at night the lights dim. It now idles rough-not sure if related. I was thinking alternator or battery but had them checked and they tested ok. (Kragen Auto parts) the battery (voltage?) gauge needle only declines when I accelerate

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  • MTBKER1 Feb 02, 2009

    could this cause it to run roughly also?

  • Anonymous Mar 15, 2014

    idle rough at startup

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One thing that you may want to try is go back to the auto parts store and rev the engine up to your normal RPM when your driving around 60mph.  I work at an auto parts store and I have tested alternators that have tested fine, then we revved the engine and then the alternator failed the load test.  But I would say that your alternator is bad just from what I hear.

Posted on Feb 02, 2009

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You need to have the altinator checked while under a load. if its checked with no load on it then it will test ok. in other words you have a altinator that is going bad.

Posted on Feb 02, 2009

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